Humidifier



FIG. 1 is a left, front, top perspective view of a humidifier in accordance with the present invention;

FIG. 2 is a right, front, top perspective view thereof;

FIG. 3 is a back, right, top perspective view thereof;

FIG. 4 is a left, back, top perspective view thereof; and,

FIG. 5 is a front elevation view thereof.

The broken lines represent portions of the structure that form no part of the claim. 

CLAIM The ornamental design for a humidifier, as shown and described. 